There are many kinds of WAN interfaces. The following description of the WAN interface is wrong ______ .

There are many kinds of WAN interfaces. The following description of the WAN interface is wrong ______ .

The AV24 protocol interface can work in both asynchronous and asynchronous modes. In asynchronous mode, the link layer uses PPP encapsulation.

The BV35 protocol interface can work in both asynchronous and asynchronous modes. In asynchronous mode, the link layer uses PPP encapsulation.

C. BRI / PRI interface is used for ISDN access, the default link encapsulation is PPP

The DG703 interface provides high-speed data synchronization communication services.

Answer: B

Explanation:

V . 24 Support same and asynchronous: asynchronous maximum rate 115kps synchronous maximum rate 64kbps

V . 35 only supports synchronization: the highest rate is 2048000bps = 2Mbps

Two access methods of ISDN :

BRI interface → 2B + DB channel 64kbps D channel 16kbps

PRI interface → E1 30B + D

T1 23B+D

Default PPP encapsulation